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Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula

Ice-free terrestrial environments of the western Antarctic Peninsula are expanding and subject to colonization by new microorganisms and plants, which control biogeochemical cycling. Measuring growth rates of microbial populations and ecosystem carbon flux is critical for understanding how terrestri...

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Autores principales: Purcell, Alicia M., Dijkstra, Paul, Hungate, Bruce A., McMillen, Kelly, Schwartz, Egbert, van Gestel, Natasja
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10689830/
https://www.ncbi.nlm.nih.gov/pubmed/37872274
http://dx.doi.org/10.1038/s41396-023-01536-4
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author Purcell, Alicia M.
Dijkstra, Paul
Hungate, Bruce A.
McMillen, Kelly
Schwartz, Egbert
van Gestel, Natasja
author_facet Purcell, Alicia M.
Dijkstra, Paul
Hungate, Bruce A.
McMillen, Kelly
Schwartz, Egbert
van Gestel, Natasja
author_sort Purcell, Alicia M.
collection PubMed
description Ice-free terrestrial environments of the western Antarctic Peninsula are expanding and subject to colonization by new microorganisms and plants, which control biogeochemical cycling. Measuring growth rates of microbial populations and ecosystem carbon flux is critical for understanding how terrestrial ecosystems in Antarctica will respond to future warming. We implemented a field warming experiment in early (bare soil; +2 °C) and late (peat moss-dominated; +1.2 °C) successional glacier forefield sites on the western Antarctica Peninsula. We used quantitative stable isotope probing with H(2)(18)O using intact cores in situ to determine growth rate responses of bacterial taxa to short-term (1 month) warming. Warming increased the growth rates of bacterial communities at both sites, even doubling the number of taxa exhibiting significant growth at the early site. Growth responses varied among taxa. Despite that warming induced a similar response for bacterial relative growth rates overall, the warming effect on ecosystem carbon fluxes was stronger at the early successional site—likely driven by increased activity of autotrophs which switched the ecosystem from a carbon source to a carbon sink. At the late-successional site, warming caused a significant increase in growth rate of many Alphaproteobacteria, but a weaker and opposite gross ecosystem productivity response that decreased the carbon sink—indicating that the carbon flux rates were driven more strongly by the plant communities. Such changes to bacterial growth and ecosystem carbon cycling suggest that the terrestrial Antarctic Peninsula can respond fast to increases in temperature, which can have repercussions for long-term elemental cycling and carbon storage.
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spelling pubmed-106898302023-12-02 Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula Purcell, Alicia M. Dijkstra, Paul Hungate, Bruce A. McMillen, Kelly Schwartz, Egbert van Gestel, Natasja ISME J Article Ice-free terrestrial environments of the western Antarctic Peninsula are expanding and subject to colonization by new microorganisms and plants, which control biogeochemical cycling. Measuring growth rates of microbial populations and ecosystem carbon flux is critical for understanding how terrestrial ecosystems in Antarctica will respond to future warming. We implemented a field warming experiment in early (bare soil; +2 °C) and late (peat moss-dominated; +1.2 °C) successional glacier forefield sites on the western Antarctica Peninsula. We used quantitative stable isotope probing with H(2)(18)O using intact cores in situ to determine growth rate responses of bacterial taxa to short-term (1 month) warming. Warming increased the growth rates of bacterial communities at both sites, even doubling the number of taxa exhibiting significant growth at the early site. Growth responses varied among taxa. Despite that warming induced a similar response for bacterial relative growth rates overall, the warming effect on ecosystem carbon fluxes was stronger at the early successional site—likely driven by increased activity of autotrophs which switched the ecosystem from a carbon source to a carbon sink. At the late-successional site, warming caused a significant increase in growth rate of many Alphaproteobacteria, but a weaker and opposite gross ecosystem productivity response that decreased the carbon sink—indicating that the carbon flux rates were driven more strongly by the plant communities. Such changes to bacterial growth and ecosystem carbon cycling suggest that the terrestrial Antarctic Peninsula can respond fast to increases in temperature, which can have repercussions for long-term elemental cycling and carbon storage. Nature Publishing Group UK 2023-10-23 2023-12 /pmc/articles/PMC10689830/ /pubmed/37872274 http://dx.doi.org/10.1038/s41396-023-01536-4 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Purcell, Alicia M.
Dijkstra, Paul
Hungate, Bruce A.
McMillen, Kelly
Schwartz, Egbert
van Gestel, Natasja
Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula
title Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula
title_full Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula
title_fullStr Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula
title_full_unstemmed Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula
title_short Rapid growth rate responses of terrestrial bacteria to field warming on the Antarctic Peninsula
title_sort rapid growth rate responses of terrestrial bacteria to field warming on the antarctic peninsula
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10689830/
https://www.ncbi.nlm.nih.gov/pubmed/37872274
http://dx.doi.org/10.1038/s41396-023-01536-4
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